INS/UPD/DEL RETURNING for 8.2

Patch for core and PL/pgSQL to support the INSERT/UPDATE/DELETE RETURNING
syntax in 8.2

INSERT/UPDATE/DELETE seem to work fine in normal operation but there is an
error with DELETE RETURNING when used through PL/pgSQL.

Here's an example PL/pgSQL test:

CREATE SEQUENCE test_id_seq START 1 INCREMENT 1;

CREATE TABLE test_tbl (
test_id BIGINT NOT NULL
DEFAULT nextval('test_id_seq'),
test_name VARCHAR(64) NOT NULL,
PRIMARY KEY (test_id));

CREATE OR REPLACE FUNCTION test_func (test_nm VARCHAR)
RETURNS VOID AS $$
DECLARE
current_rec RECORD;
BEGIN
-- Test INSERT RETURNING
INSERT INTO test_tbl (test_name) VALUES (test_nm)
RETURNING * INTO current_rec;

RAISE NOTICE 'test_id is %', current_rec.test_id;
RAISE NOTICE 'test_name is %', current_rec.test_name;

-- Test UPDATE RETURNING
UPDATE test_tbl SET test_name = 'Uncle Bob'
WHERE test_id = current_rec.test_id
RETURNING * INTO current_rec;

RAISE NOTICE 'test_id is %', current_rec.test_id;
RAISE NOTICE 'test_name is %', current_rec.test_name;

-- Test DELETE RETURNING
DELETE FROM test_tbl WHERE test_id = current_rec.test_id
RETURNING * INTO current_rec;

-- This DOES NOT WORK
RAISE NOTICE 'test_id is %', current_rec.test_id;
RAISE NOTICE 'test_name is %', current_rec.test_name;

RETURN;
END;
$$ LANGUAGE plpgsql;

--
Jonah H. Harris, Database Internals Architect
EnterpriseDB Corporation
732.331.1324